In a small bowl, mix the crushed peppercorns with the chopped coriander.
Heat some oil in a wok or heavy-based frying pan and add the crushed pepper and coriander mixture, the asparagus, beans, garlic and sugar. Stir-fry for about 30 seconds to mix well, then add the water.
Cover the pan and steam for about 2 minutes, or until the vegetables are tender.<